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Paul Roberts lost his job with Stagecoach as a result of the fight

A witness told the court Allen, of Mariners Lane, Norwich, had been swearing at Roberts about his driving and was threatening him.

The prosecution said Roberts, who is trained in martial arts, lost control.

Three magistrates decided that although Roberts had been subjected to "considerable abuse", the fact he returned to Allen after walking away and continued the fight, negated any claims of self defence.